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Finding the Fourth Proportional to 986.88, 1,362.72 and 677.28

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Solution

The fourth proportional to 986.88, 1,362.72 and 677.28 is: 935.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.88 : 1,362.72 = 677.28 : x
  2. Step 2: Convert to fraction form
    986.88/1,362.72 = 677.28/x
  3. Step 3: Cross multiply
    986.88x = 1,362.72 × 677.28
  4. Step 4: Simplify right side
    986.88x = 922,943.00
  5. Step 5: Solve for x
    x = 922,943.00/986.88
  6. Step 6: Final answer
    x = 935.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.